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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295dd44c4ccdb5056d2aa46b7a7b05f876c0b14671ab7bf5a632341acc6c3840' 
  AND token = 'Q2tybHQ/hiElbfm/V7AnmD/HDa0J6q+WBzs+/U28chY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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