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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b087b693dcf7aa5ed477a0cd7d8be8c2628919a6fe05733da7b473f8d5947d' 
  AND token = '4x9UUU5+rczSJo3eh8Mgcrzxa5f/2rBuzO1EiWUvYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}