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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ad98b3e73efe9cb3ba482e8e76b1ce5504aebb129f90dbf3a61dc8e07ae108' 
  AND token = 'hyWLsmRyYSoUffJB40iIN9lihAav7fKNtdw8KdEtMUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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