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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78511eb870e5a3e31d1a73f78b0e648806de9236a1bdee7a5d6912585921fe6c' 
  AND token = 'TSKi2WTSrE4piIFfxsFQSxIVlfFIH9WhGlR0aFkcEdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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