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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489587e7165c6ca646d7ed0b6d26d40739a2b176baa802734fa058426563e34b' 
  AND token = 'invNZuQwoJGc7nBiTEMIggG6O7/7RJqvWO0Ijq1EHyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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