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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f9ca1d9bb83f3b4330a22f1c94becbfb733145521d300fea532a672a109020' 
  AND token = '0xPjzvEOMuo9QPBe2KEaASCMrTMRwkspXKYMZ0QMURQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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