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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900ea2885443bddd6008d93403a4ad101e1014a3ef6c5716ea58bd53706e2e45' 
  AND token = '6OCJ2vnuIt5eULHhliNMstRs4OM5Y7BTNH0BAea1OMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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