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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8608cd4e062bed00ea98efdd7830c9643d7e7dde022c859497a4ae56f36dba' 
  AND token = '5ywj3b7odOx86cczjjf/u4TuLqXvaMOzOzERdMm0uUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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