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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f5e0064c00fa5a663218a812e91a2aad8f4d924d469f9fd2b0d4fb64bb9c40' 
  AND token = '/SfrHxAaIheG2TEcHzhaZb2CfIQV3G32EPf/uLsDvZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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