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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906573e4c053e1b01e0dd9d86c851a7b032d28bee98ddc9c8eb81a5a2e9234b0' 
  AND token = 'n7Uyx6TXNewXm4PcpYE1J4l94nadgcIfaPXkmi+R4DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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