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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e805286e324d436067387861510d7f44971898932e4f286ac2244f6f901c9e19' 
  AND token = 'EGywYjn4ZwYgv0jXFGl1SKsdjUkhlijtVaL4jEK6M6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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