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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05290bb0c5f893167baa16aba1babaf47519af97916c3657646bfa0c462c2ae' 
  AND token = 'g3SaLUlAasul6ZaZ+ylwcF9R22DPdIESO4o+pTuucE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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