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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbf97c89d68172c62f3f15ab8aeda1d13e1feaa06a7c65e854fdec4018d5e9b' 
  AND token = 'PBmlOkY1/Tk7ORoYfeJ94MdYk4U1lMzgV07fYgXsNz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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