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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1cf6cbec7e1613d4d00f6f3060c5dd1464cbc04d45a5cf8b8b5d674f70e393' 
  AND token = 'pYFNcZkY8K5YArhNrNsVQg2rLwsk2jHX6Qyx9rRuMsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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