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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c56754e3610297a0c7587f3402cb177c5a988d94900386bf8222427a4a676c6' 
  AND token = 'vMn5/Ux36o71AD5wEt5BNrcfz4a8o0QkhyX84ddri7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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