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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667ba2dcd4b2da817575774724e85a3ad117949be4b4ce5ba4100def9395fde9' 
  AND token = 'lqq0Ri0Sp88yvgYtc9sh0lKLfjVsaRotVx1gc+fE1G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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