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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cdafaef64dfd4e176a247b62b345b744decb0505d28c071e5835d0c1759919' 
  AND token = '4IKaJOaG2M9AtTnbkqiq8d3QbfzWLCPwNVX35o6pXfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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