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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae30ed905dd1ea60201a9c727b64b17b5a5d259b690f29c3ee4350bb74f88da' 
  AND token = 'Z/Pd0LbJiUlEzq44oObJ2Xi7T12sTor1Q2/7m5J3bDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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