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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e176383710f1087a1b0bef7cb52d5161be9151f5dcfbca7cd1b04f91f9af1377' 
  AND token = 'cRn4mUIw2YrWSanqDIe1wAflA7/Wd0gHeb9J+cRQAcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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