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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a523e08d81b695cf4b60987e82472720e255d3d5ec297839140dcbf20565400' 
  AND token = '1H0/fODwccsHJ1uSyh/fsabRog3a09GZ5kmwLQc/jP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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