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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146f561b5c11a2d883bb82fe9455bb39a179c74b3e02e78a00f6159fb4a0aed0' 
  AND token = 'gDk32oJw1waclKIlPYDZra0Z4VdPfOLGJA/uQPVF73U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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