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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b717a665728b5ec574966d31845f2632781cca85bc5416b1b18f2e473b1d0eb7' 
  AND token = '6g3++DH2IQ2D9gyAUv0xmp4VSKohXO8KT8+/yvh8x6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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