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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaf4515a797c503d3e191a60dbac5234d6bb7d78ad4ac30c117621e08875954' 
  AND token = '6ZTpqHxQtqvRe7do7A7Tz76XTuXBJK5glgrnJMN8hiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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