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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5984a7d1c87efdd769da49abe75f81ad25c7ffa19da711f1746d9230209509e9' 
  AND token = '9pC2DhltvuvJQ5EmHU0VUfLDqhTCAQp5bZKsbn3YEQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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