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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bc3451fd866e8ae81b39217ecb629f13400750d9ebe57d1639858ab7a0bdef' 
  AND token = 'yjnemNS61OO6le+es7zICqNe30cCwQaIFZr6IT49OE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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