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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dd54599ab82a7346207b14a74dfc6ce8beb5225d073a1b2782dfbb9b5e7c19' 
  AND token = '0TnwpqVo8OGmciu1ahARF0Dj3WJVMhs+FxyY+7IEcY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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