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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3719cdacffaff604bdb68f7999060fe361beee7ab26d71e6898e1b671a7ee3' 
  AND token = '6/i11OyKngXLVHBJHZoTZPhCrK1asQ2mD6NW1bFaTD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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