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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edd3b4e78c5970491bd2881b008c14c57def493a10bec2ab79324e438af6b4b' 
  AND token = 'yyiBs6dlw8vWWr7S2OKfFPcAWfZ+basQcyHw71uAUEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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