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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6350a2cd2911eb07ca28a63dcd5d5b366d9de31d670aae3aa0d19414b00e67af' 
  AND token = 'VEKaDFhcDVV/uJOZ0Yt3uzj9AaR/yrmEotdBOPyghBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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