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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30551de901e375259360daae6b8b9e91cc313ec74af681998d4e2b716a4186bd' 
  AND token = 'IMOTJlnXUOTO/8PFQkEId3SZmVhY6t/VBtUrsvbU1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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