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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7672d2b4eeec636910388fb02ba38e428290aea3672fedb22be05ce93ea52456' 
  AND token = 'zg8lzr/jzkmwiVViXrER/Gw6N7hdeAzgzGhboJpbF7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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