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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c75b209ccc0c85eb4059b826bb8a7f60572bf8c8fb1e9ef7a67d0a48e23c27' 
  AND token = 'ddU96lp+Ze7kYHjyBieslcaI/P9H0jxofGcd/N8grGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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