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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad07d44280efdc53b7b9c7d51b40e667e46a750b388b0011903574c59ac8a0b' 
  AND token = 'En0RH1tIIZGEOaP2b67zbdMnjzsBPKMQCva/Y+ErK6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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