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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3577079b04838a939e933e2f21526c8d99fbf3d8aaffe85f03539f450cd43315' 
  AND token = 'mNGdcvdNf+/F+0ZZqMKXSzGGalPen4L6cSUjANcOyo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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