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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a0fd3c57f2e9807b414d43e9b6f379820ab166a2180f481ac8f2c9d1a01d51' 
  AND token = 'ElidSod/UDs2sqayBzNM/sNXatLjwdU/CN82wH7/uLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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