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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a036a9359ca32932d73bfbbae1dd6d2eba8c20187fa4cd4ea576d2daaaa933' 
  AND token = 'fc3asDcoG0s+E7ZTNkHY+VAA6AlAQOI/rZL7hn42taY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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