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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156903b209089760d34267234d9aea5a7b29e397964f13ae29b5f02018a674c3' 
  AND token = 'hYI2p1xnNPoMDjU2Ti130WTGn4B6JH5EyFoCOO/gnVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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