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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c82ea8cc18732f2185e9d6dc8d983a3efb2ae046686ad163ecfba93e3587d35' 
  AND token = '48u8VY6mAi43Bi6dvoZZtxVrhvSUGLQ5orW1JUpfmBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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