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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a4a6a2b03f7df05bef05853cff7f72c49b68ad05d1268584763234ba7e2d4a' 
  AND token = 'S5g31bnGDGvOWDUV9/yRLfaDjZ1Tf3jQIA8XQ1IgJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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