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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17416c58b942a5d2ad3b6a40e301150eaf547499ea8cdca427495b3c15e1701b' 
  AND token = 'SoU1hywHpqKiZGffQbFxibqMCK7ncaf1n2oarr+J6B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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