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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494dfb06fbbe7d94f6341d7100cf80a0ec64e83b76241ab3c1c0dbb217abebfd' 
  AND token = 'HJ+s8BCu1MHNZV7OAdw7WmBHjTiFTC/pdruItLslrag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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