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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deae098482b2f3fa67aa73867a9df6c2c7de362cdb85ad3ae39f321981487359' 
  AND token = 'UJjuE/5Pe9434RS2wFgeJlSER1tGdCrmEi3kKPHlero=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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