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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f5ecafac5bdd4c4d7fdc5bdbd9b7c40d80545954c04094e204fd8432700334' 
  AND token = 'viMD6+UYx7Qup9PPKVk0UeL60yDvUPPYyt9fHqevNGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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