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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ba2416b064f35376fa6d72674f1c991dfce8cb8cddf41c854f6766148a5798' 
  AND token = 'fvo84LHi5GosjnCZCRan9TNKOVzFVUKGSbODSNbysT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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