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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038034bc5776cf8ecc488fe51f62bc9f29c02ce74720c3958737885e901c9b9e' 
  AND token = 'kG1Jk6Erd/Tk65D1LvewaluoaQm1vL3ncnL7cQDrcwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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