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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a5fb78fed358b9c97d68b2660b6d356a30a600e5b57326ac467229858f99a0' 
  AND token = 'i34UkoM4fOQN1qZqu5uZRlEVSGONP9Iry0pYaa9ixDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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