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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7813812a4cde971aebed2eace8dc89f42c99f262e76c694365a90d14db727051' 
  AND token = 'GSQKe1GVrX+e5NjzcJjPB6PX9wPOIJS7fIR2H6j6zl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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