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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fae4abe51a00a0dda552c0e13a72a744f31cc4e3c3a34a73b89d3bc0a52214' 
  AND token = 'rMT57pz4uMxNeQu8tTstlfvTKMvzJdI2M/bfjVotEHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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