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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb0a4c9637a5698bb4e768e3eacca89759c66ca07d0f7cc536ab7ba7ba48a85' 
  AND token = 'VvqXFS2nNKfFBQOg7qu4mnkvKNHsLP+2B3Yuv9HKiLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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