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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02055b28103fec3a09b779307cca804fcee19fa1ee731b145a2a87a98980028' 
  AND token = '4jGH4RuG61JhvMKbE9ClH78cI1yeg7iF/UGHKEDRb4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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