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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ce70b9d1f2961fe4455c9eb34ce7d4e79cf4c0bcf1df3acba0a2d15c64edc9' 
  AND token = 'jpgxUge3USNokpngxeZwJOmHtu2NmxrGfcpgA3fjK6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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