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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69cf4dbf4fa4bce6b855a0cbfc24ad59a660db9019652fb99ecb73a4fe3d429' 
  AND token = 'wZo943sETG2MnubqPxIw1UUIk/IT2+eNyZmunrRq904=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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