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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e243c6883571cbc7a3d5715e35d791548d0309a22a874f5df76a228c68b7a092' 
  AND token = 'bS7rUnK8dhv4lwhd+JssQofOBP+ck8er9RJTJ/+V18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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