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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31e2fc9cfc41d5aeddc30b7315079e7bed5a7c55de35e9fcbd3d6338d00d3f4' 
  AND token = 'P1deGiGkV7Oh3nAX0r+tr3MjCkHNZ/3L5xLVJY8AmTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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