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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdccc3888110f459d1bc3b3aa7505216568072fa9ddd420e770abb1aa7e0a4f' 
  AND token = 'jKvY2mfwdzPsE08LmN+JuI0dQEd7Geuw87MjzBbuziM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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