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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5770160f7c7fa3a6bfe6de97495afbee4863981deba2a2b2ab248969ebf8c1d2' 
  AND token = 'tAjKHMgsAOFZ5nU0p5akAUqbCxWdQvxp2SNc3IJBe14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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