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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4aa052b4c425e8e25323ec05df7d4819ccc59cb6c90292cd5e1fcc12a92250' 
  AND token = 'ol4pKsJLCukViaeJXP0ncH2Bn5u2Hk9sZVs2T6ALS4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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