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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d22c716fbfd1c8cc7908fff0ac68a76e7a93ef0b9dac10c160cbb28780bbecc' 
  AND token = 'RGIOdAJ+qmbNcT3Gm70mU1gFEx9lFGzG+P2kH1vQDwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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